Question about Cobra 29 LTD CB Radio

1 Answer

New Cobra 29 ltd

Here's the problem, I had a smaller cobra cb abd decided to move up. Both radios have incoming transmissions but when I try and talk to anyone they dont hear me, The antenna I have is a Fire cracker 1000 watt antenna. I had the smaller one working in my other truck (Freightliner century classic) I am now in a T-600 KW. I am at a loss here. Anyone who is a Trucker Knows thw value of having communacation with other truckers.

Please Help !!!!

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  • marknadeau5 Nov 05, 2008

    Ok gotcha , I was a little short on areas of concern. Ok the two radios are both cobra the LTD 29 and the other is their cheaper radio, just a good old 40 channel black radio. The other truck (Freightliner was a company truck and had the Standard Stock antennas (two) on either side of the truck. The T-600 KW
    had no antennas on it so I bought a NEW CB ie: 29LTD and antenna (Firestick) and installed them. at first I was told that the mirror had to be grounded so I did that from frame to mirror. To no avail I still have the same problem. To answer your next questionn I will asume you;ll ask ,,,lol yes I did the intial setup and swr calabration, I adjusted it so that the meter does not go all the way into the red and peg out.

    Thank you for any more input you might have this is driving me crazy... :)


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Hi,

Appreciate the direct "Ask Me". If I may clear up your concern:

  • you have two CB radios, one is a Cobra 29LTD and the other?
  • both have received and both do not transmit;
  • you have two trucks, one with a Firecracker 1000 antenna, and the other?
In any case and initially, TX (transmit problems) could be caused by:
  • defective PTT/mic;
  • defective finals/drivers;
  • defective PL-259 connector/RG58 Cable;
  • antenna grounding/SWR;
  • other electronics internally
Please check the above. You may need an SWR meter, a watt meter and a DVM/VOM to perform the tests.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information. Good luck and kind regards. Thank you for using FixYa.

Posted on Nov 05, 2008

  • Louie  Role
    Louie Role Nov 05, 2008

    Hi again,

    Appreciate the quick reply. A few ideas hopefully to guide you:


    • the ground is very important for communications equipment. The antenna must be chassis grounded but equally the radio must be grounded. This is separate from the black negative wire of the power cord. Grounding the radio could also be accomplished by attaching its metal bracket to any metal part of the truck;

    • technically, it is the antenna that must be adjusted. The SWR adjustment is nothing more but a baseline calibration. Measuring the SWR is accomplished by switching the selector to CAL, while pressing the mic's PTT, adjust till the needle reaches maximum deflection; release the mic, switch selector to SWR, press on the mic, the deflection of the meter needle is the SWR measurement. The rule is the lower the SWR the better. Pls remember when on CAL, max deflection, when on SWR must be the lowest;

    • if the SWR is high, then transmit would be inhibited, lowered down that is why it is important to keep the SWR low to have high transmit;

    • if even at CAL the needle will not deflect max, it means the finals are toasted and would require replacement.
    Pls check the SWR of both setups.

    Incidentally, the cable and/or the connector has been known to cause high SWR, pls double check how the cable is soldered to the connector (PL-259).

    Cheers.


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